Don't know how helpful this is, but I suspect you need to understand academic essay structure from their POV better. Something I'm still working on.
It means setting aside per-conceptions and starting over from a POV of 'How would you like this stuff presented' and it can be a bit soul destroying at the time, but it will get you there in the end.
If you have a good vocabulary and are verbally articulate, it may well be assumed you can figure it out easily enough, and ought to already have learnt and understood grammar . I find dealing with assumptions can be the most difficult bit.
Some issues I know I have are not integrating quotes into my work well enough, (causes confusion) and I've gone from being told my sentences are too long, to I shouldn't be making shorter sentences, they should be continuous paragraphs.
I can see there is a lack of 'flow' but currently don't know how to address it.
Another big stumbling block issue is taking facts and stating X & Y means that it was easy for Z to subsequently happen.
Hasty example: A main road crossing is removed, a school is subsequently built, the figures for child vs car collisions go through the roof. I've covered these things as referenced facts earlier in the essay.
I then extrapolate that 'poor planning for children to safely access the school is the reason for raised injury and mortality.' It's logical but not academically acceptable as it's too much of my opinion and can only be stated if someone else has already said it, so it can be referenced. I find it so hard to pick out when I'm incorrectly stating what to me feels like the bloody obvious, but hey ho, that's what's wanted, so...
My method of writing is also painfully hard work, but I'm unable to plan essays using the approved systems, so work backwards.
If you are able to follow essay planning there should be a whole section in your library devoted to it. If you aren't, tough it out, you'll find a way round.
As previously one of the hopeless, I just got an indicative first, though with several caveats that parts didn't meet academic standards at all.
Whatever the issues the fact you want to succeed will carry you. You just have to keep picking yourself back up, read the criticism carefully, take it to others if you don't understand it, and book tutorials with whoever is telling you it's not what they wanted. It can be bruising, but no fight get won easily.
If you ask for this to be moved to the mature students board, you'll find others at varying stages of similar issues.